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  • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
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  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/4965—Non-condensed pyrazines
  • A61K31/497—Non-condensed pyrazines containing further heterocyclic rings
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  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
  • A61K31/517—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim ortho- or peri-condensed with carbocyclic ring systems, e.g. quinazoline, perimidine
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• • A—HUMAN NECESSITIES
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  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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  • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
  • C07D409/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing three or more hetero rings
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  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
  • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
  • C07D471/04—Ortho-condensed systems

Definitions

• the present invention relates to compounds of general formula (I)
• WO 08135557 discloses compounds of similar structure showing ENaC (Epithelial Sodium Channel) inhibitor activity.
• the problem of the present invention is to prepare new compounds which may be used therapeutically for the treatment of pathophysiological processes treatable by the blockade of an epithelial sodium channel, particularly for the treatment of the lungs and airways.
• the present invention therefore relates to a compound of formula (I),
• Preferred compounds of formula (I) are those wherein
• a further embodiment of the current invention are compounds of formula (I) or a pharmaceutically acceptable salt thereof for use as a medicament.
• a further embodiment of the current invention are compounds of formula (I), or a pharmaceutically acceptable salt thereof for use in the treatment of a disease selected from among respiratory diseases or complaints and allergic diseases of the airways.
• a disease selected from among chronic bronchitis, acute bronchitis, bronchitis caused by bacterial or viral infection or
• a further embodiment of the current invention is a pharmaceutical composition
• a pharmaceutical composition comprising at least one compound according to the invention or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.
• a further embodiment of the current invention is medicament combinations which contain, besides one or more compounds according to the invention and, as further active substances, one or more compounds selected from among the categories of further ENaC inhibitors, betamimetics, anticholinergics, corticosteroids, PDE4-inhibitors, LTD4-antagonists, EGFR-inhibitors, dopamine agonists, H1-antihistamines, PAF-antagonists, MAP-kinase inhibitors, MPR4-Inhibitors, iNOS-Inhibitors, SYK-Inhibitors, corrections of the cystic fibrosis transmembrane regulator (CFTR) and CFTR potentiators or double or triple combinations thereof.
• further ENaC inhibitors betamimetics, anticholinergics, corticosteroids
• PDE4-inhibitors LTD4-antagonists
• EGFR-inhibitors dopamine agonists
• H1-antihistamines PAF-antagonists
• C 1-6 -alkyl means an alkyl group or radical having 1 to 6 carbon atoms.
• radical attachment point(s) to the molecule from the free valences of the group itself.
• the terminal bond indicates the radical attachment point, for example, the substituent “aryl-C 1-3 -alkyl-” means an aryl group which is bound to a C 1-3 -alkyl-group, the latter of which is bound to the core or to the group to which the substituent is attached.
• 3-carboxypropyl-group represents the following substituent:
• the asterisk may be used in sub-formulas to indicate the bond which is connected to the core molecule as defined.
• a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound.
• substituted means that any one or more hydrogens on the designated atom is replaced with a selection from the indicated group, provided that the designated atom's normal valence is not exceeded, and that the substitution results in a stable compound.
• lower-molecular groups regarded as chemically meaningful are groups consisting of 1-200 atoms. Preferably such groups have no negative effect on the pharmacological efficacy of the compounds.
• the groups may comprise:
• treatment means therapeutic treatment of patients having already developed one or more of said conditions in manifest, acute or chronic form, including symptomatic treatment in order to relieve symptoms of the specific indication or causal treatment in order to reverse or partially reverse the condition or to delay the progression of the indication as far as this may be possible, depending on the condition and the severity thereof.
• treatment of a disease means the management and care of a patient having developed the disease, condition or disorder.
• the purpose of treatment is to combat the disease, condition or disorder.
• Treatment includes the administration of the active compounds to eliminate or control the disease, condition or disorder as well as to alleviate the symptoms or complications associated with the disease, condition or disorder.
• phrases “pharmaceutically acceptable” is employed herein to refer to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, and commensurate with a reasonable benefit/risk ratio.
• pharmaceutically acceptable salts refer to derivatives of the disclosed compounds wherein the parent compound is modified by making acid or base salts thereof.
• examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic residues such as amines; alkali or organic salts of acidic residues such as carboxylic acids; and the like.
• such salts include salts from ammonia, L-arginine, betaine, benethamine, benzathine, calcium hydroxide, choline, deanol, diethanolamine (2,2′-iminobis(ethanol)), diethylamine, 2-(diethylamino)-ethanol, 2-aminoethanol, ethylenediamine, N-ethyl-glucamine, hydrabamine, 1H-imidazole, lysine, magnesium hydroxide, 4-(2-hydroxyethyl)morpholine, piperazine, potassium hydroxide, 1-(2-hydroxyethyl)-pyrrolidine, sodium hydroxide, triethanolamine (2,2′,2′′-nitrilotris(ethanol)), tromethamine, zinc hydroxide, acetic acid, 2.2-dichloro-acetic acid, adipic acid, alginic acid, ascorbic acid, L-aspartic acid, benzenesulfonic acid, be
• the pharmaceutically acceptable salts of the present invention can be synthesized from the parent compound which contains a basic or acidic moiety by conventional chemical methods.
• such salts can be prepared by reacting the free acid or base forms of these compounds with a sufficient amount of the appropriate base or acid in water or in an organic diluent like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile, or a mixture thereof.
• Salts of other acids than those mentioned above which for example are useful for purifying or isolating the compounds of the present invention e.g. trifluoro acetate salts, also comprise a part of the invention.
• aryl as used herein, either alone or in combination with another radical, denotes a carbocyclic aromatic monocyclic group containing 6 carbon atoms which may be further fused to a second 5- or 6-membered carbocyclic group which may be aromatic, saturated or unsaturated.
• Aryl includes, but is not limited to, phenyl, indanyl, indenyl, naphthyl, anthracenyl, phenanthrenyl, tetrahydronaphthyl and dihydronaphthyl.
• heterocycle is intended to include all the possible isomeric forms.
• heterocyclyl includes the following exemplary structures which are not depicted as radicals as each form may be attached through a covalent bond to any atom so long as appropriate valences are maintained:
• heteroaromatic means heteroaryl, monocyclic C 5-6 -heteroaryl, or bicyclic C 8-14 -heteroaryl.
• heteroaryl is intended to include all the possible isomeric forms.
• heteroaryl includes the following exemplary structures which are not depicted as radicals as each form may be attached through a covalent bond to any atom so long as appropriate valences are maintained:
• monocyclic C 5-6 -heteroaryl is intended to include all the possible isomeric forms.
• bicyclic heteroaryl rings examples include pyrrolizine, indole, indolizine, isoindole, indazole, purine, quinoline, isoquinoline, benzimidazole, benzofuran, benzopyrane, benzothiazole, benzoic) isothiazole, pyridopyrimidine, pteridine, pyrimidopyrimidine.
• the term “monocyclic C 5-7 -heterocyclyl” is intended to include all the possible isomeric forms.
• C 5-6 -heteroaryl includes the following exemplary structures which are not depicted as radicals as each form may be attached through a covalent bond to any atom so long as appropriate valences are maintained:
• r 0, 1 or 2
• the term “bicyclic C 8-10 -heterocyclyl” is intended to include all the possible isomeric forms.
• bicyclic C 8-10 -heterocyclyl includes the following exemplary structures which are not depicted as radicals as each form may be attached through a covalent bond to any atom so long as appropriate valences are maintained:
• annelated species of aryl or heterocyclyl as used herein, either alone or in combination with another substituent wherein the annelated species presents as an aryl-het (a), a hetaryl (b) or a het-het (c) annelation means a monovalent substituent derived by removal of one hydrogen from an aromatic monocyclic system or aromatic multicyclic systems containing carbon atoms, which is annelated to a five-, six- or seven-membered saturated or unsaturated (including aromatic) heterocycle containing carbon atoms and one, two, three or four ring heteroatoms selected from nitrogen, oxygen and sulfur or
• a five-, six-, or seven-membered saturated or unsaturated (including aromatic) heterocycle containing carbon atoms and one, two, three or four ring heteroatoms selected from nitrogen, oxygen and sulfur which is annelated to an aromatic monocyclic system or aromatic multicyclic systems containing carbon atoms or a five-, six-, or seven-membered saturated or unsaturated (including aromatic) heterocycle containing carbon atoms and one, two, three or four ring heteroatoms selected from nitrogen, oxygen and sulfur, which is annelated to a five-, six-, or seven-membered saturated or unsaturated (including aromatic) heterocycle containing carbon atoms and one, two, three or four ring heteroatoms selected from nitrogen, oxygen and sulfur.
• Suitable examples of a annelated species of aryl or het include: quinolinyl, 1-indoyl, 3-indoyl, 5-indoyl, 6-indoyl, indolizinyl, benzimidazyl or purinyl.
• halogen as used herein means a halogen substituent selected from fluoro, chloro, bromo or iodo.
• C 1-n -alkyl wherein n is an integer from 2 to n, either alone or in combination with another radical denotes an acyclic, saturated, branched or linear hydrocarbon radical with 1 to n C atoms.
• C 1-5 -alkyl embraces the radicals H 3 C—, H 3 C—CH 2 —, H 3 C—CH 2 —CH 2 —, H 3 C—CH(CH 3 )—, H 3 C—CH 2 —CH 2 —CH 2 —, H 3 C—CH 2 —CH(CH 3 )—, H 3 C—CH(CH 3 )—CH 2 —, H 3 C—C(CH 3 ) 2 —, H 3 C—CH 2 —CH 2 —CH 2 —CH 2 —, H 3 C—CH 2 —CH 2 —CH(CH 3 )—, H 3 C—CH 2 —CH(CH 3 )—CH 2 —, H 3 C—CH(CH 3 )—CH 2 —, H 3
• C 1-n -alkylene wherein n is an integer 2 to n, either alone or in combination with another radical, denotes an acyclic, straight or branched chain divalent alkyl radical containing from 1 to n carbon atoms.
• C 1-4 -alkylene includes —CH 2 —, —CH 2 —CH 2 —, —CH(CH 3 )—, —CH 2 —CH 2 —CH 2 —, —C(CH 3 ) 2 —, —CH(CH 2 CH 3 )—, —CH(CH 3 )—CH 2 —, —CH 2 —CH(CH 3 )—, —CH 2 —CH 2 —CH 2 —CH 2 —, —CH 2 —CH 2 —CH(CH 3 )—, —CH(CH 3 )—CH 2 —CH 2 —, —CH 2 —CH(CH 3 )—CH 2 —, —CH 2 —C(CH 3 ) 2 —, —C(CH 3 ) 2 —CH 2 —, —CH(CH 3 )—CH(CH 3 )—, —CH 2 —CH(CH 2 CH 3 )—, —CH(CH 2 CH 3 )—,
• C 2-n -alkenyl is used for a group as defined in the definition for “C 1-n -alkyl” with at least two carbon atoms, if at least two of those carbon atoms of said group are bonded to each other by a double bond.
• C 2-n -alkenylene is used for a group as defined in the definition for “C 1-n -alkylene” with at least two carbon atoms, if at least two of those carbon atoms of said group are bonded to each other by a double bond.
• C 2-n -alkynyl is used for a group as defined in the definition for “C 1-n -alkyl” with at least two carbon atoms, if at least two of those carbon atoms of said group are bonded to each other by a triple bond.
• C 2-n -alkynylene is used for a group as defined in the definition for “C 1-n -alkylene” with at least two carbon atoms, if at least two of those carbon atoms of said group are bonded to each other by a triple bond.
• C 1-6 -alkoxy (including those which are part of other groups) are meant branched and unbranched alkoxy groups with 1 to 6 carbon atoms and by the term “C 1-4 -alkoxy” are meant branched and unbranched alkoxy groups with 1 to 4 carbon atoms.
• Alkoxy groups with 1 to 4 carbon atoms are preferred. Examples include: methoxy, ethoxy, propoxy, butoxy or pentoxy.
• the abbreviations OMe, OEt, OPr, etc. may optionally be used for the above-mentioned groups.
• the definitions propoxy, butoxy and pentoxy include all the possible isomeric forms of the respective groups. Thus for example propoxy includes n-propoxy and iso-propoxy, butoxy includes iso-butoxy, sec-butoxy and tert-butoxy etc.
• C 3-n -cycloalkyl wherein n is an integer from 4 to n, either alone or in combination with another radical denotes a cyclic, saturated, unbranched hydrocarbon radical with 3 to n C atoms.
• C 3-7 -cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.
• C 3-n -cycloalkenyl denotes an cyclic, unsaturated but nonaromatic, unbranched hydrocarbon radical with 3 to n C atoms, at least two of which are bonded to each other by a double bond.
• C 3-7 -cycloalkenyl includes cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cyclohexadienyl, cycloheptenyl cycloheptadienyl and cycloheptatrienyl.
• the substituent R 1 denotes H or methyl, preferably hydrogen.
• the substituent R 2 is selected from a group consisting of
• the substituent R 3 denotes H or methyl, preferably hydrogen.
• the substituent R 4 denotes H or methyl, preferably hydrogen, or
• X denotes halogen, preferably Cl or Br, particularly preferred Cl.
• L 1 denotes a bond or is selected from the group consisting of
• the substituent R 5 is selected from a group consisting of
• the substituent R 5.1 denotes H, C 1-4 -alkyl-, C 1-4 -alkyl-CO— or C 1-4 -alkyl-SO 2 —, preferably hydrogen, methyl, or acetyl.
• the substituent R 5.2 denotes H or C 1-4 -alkyl-, preferably hydrogen or methyl.
• the substituents R 5.1 and R 5.2 together with the nitrogen atom they are attached to may form an optionally substituted 4-7-membered heterocycle containing at least one N-atom, preferably pyrrolidine, morpholine, piperazine or 2-pyridon-1-yl.
• the substituent R 6 denotes -L 2 -Y 2 -L 3 -R 6.5 or is selected from a group consisting of
• R 6 denotes -L 2 -Y 2 -L 3 -R 6.5 .
• the substituent R 6 denotes —COOH or C 1-4 -alkyl-OCO—Y 1 is selected from among (a1), (b1), (d1), (e1) and (g1).
• L 2 denotes a bond or is selected from a group consisting of —CH 2 —, —CH 2 —CH 2 —, and —CH 2 —CO—,
• Y 2 denotes a bond
• the substituent R 11 denotes -L 4 -R 9 .
• Y 2.1 denotes a cyclic linker selected from either a phenylene group optionally substituted by -L 5 R 10 , or
• L 3 denotes bond, —(CH 2 )—, —(CH 2 ) 2 —, —(CH 2 ) 2 —[O—(CH 2 ) 2 ]—, —(CH 2 ) 2 [O—(CH 2 ) 2 ] 2 —, or —(CH 2 ) 2 —[(CH 2 ) 2 ] 3 —
• Particularly preferred L 4 denotes a bond, —(CH 2 )—, or —(CH 2 ) 2 —.
• Particularly preferred L 5 denotes a bond or —O—(CH 2 ) 2 —.
• substituent R 6.5 denotes H, OH or pyridyl.
• substituent R 9 denotes H or OH.
• substituent R 10 denotes H or OH.
• the compounds according to the invention may be obtained using methods of synthesis which are known to the one skilled in the art and described in the literature of organic synthesis. General methods for functional groups protection and deprotection steps are described e.g. in: Greene, T. W. and Wuts, P. G. M . ( eds .): Protective Groups in Organic Synthesis, third edition 1999 ; John Wiley and Sons, inc . Preferably the compounds are obtained analogously to the methods of preparation explained more fully hereinafter, in particular as described in the experimental section.
• Compounds of general formula I can be prepared by reacting S-methylisothioureas of formula II with primary amines of formula III in a solvent like THF, acetonitrile or DMF or in a solvent mixture, preferably in the presence of a base, especially when the primary amine III is applied as an acid addition salt, preferably at r.t.
• Compounds of general formula II can be prepared by reacting S-methylisothiourea (which may be generated in situ from its sulphuric acid salt by addition of base) with a 1-(tert-butylcarbamoyl)prop1-en-2-yl carboxylate of general formula IV in a solvent like DCM, THF, TBME, water or a mixture of these solvents, preferably at r.t.
• Compounds of general formula IV can be prepared from the respective carboxylic acid of general formula V and a 2-tert-butyl-5-methyl-isoxazolium salt of general formula VI, which can be applied as an isolated salt (e.g.
• hexafluorophosphate salt X ⁇ PF 6
• X hexafluorophosphate salt
• the latter reaction is preferably performed in a solvent like DMF or in a solvent mixture with the addition of triethylamine or an other base, preferably while cooling to 0-10° C.
• Compounds of general formula III can be prepared from compounds of general formula VII by removal of the respective protecting group PG, preferably the BOC (tert-Butoxycarbonyl) or FMOC (9H-Fluoren-9-yl-methoxycarbonyl) protecting group which can be removed by standard acicid or basic conditions, respectively.
• protecting group PG preferably the BOC (tert-Butoxycarbonyl) or FMOC (9H-Fluoren-9-yl-methoxycarbonyl) protecting group which can be removed by standard acicid or basic conditions, respectively.
• Compounds of general formula VII can be modified using methods of synthesis which are known to one skilled in the art and described in the literature of organic synthesis, preferably by functional group protection or deprotection steps, esterifications, amidations, hydrogenations, or 1,3-dipolar cycloadditions of an azide to a terminal alkyne group or vice versa.
• Compounds of general formula VII can be prepared from secondary amines of general formula VIII, preferably either by alkylation with a compound of general formula IX (wherein the leaving group LG is preferably Cl, Br, OMesyl, or OTosyl), or by reductive amination with an aldehyde of general formula X (wherein R 2 ⁇ H).
• Compounds of general formula I can be converted into intermediates of general formula XI by BOC-protection.
• Compounds of general formulas I or XI can be modified using methods of synthesis which are known to the one skilled in the art and described in the literature of organic synthesis, preferably by functional group protection or deprotection steps, esterifications, amidations, hydrogenations, or 1,3-dipolar cycloadditions of an azide to a terminal alkyne group or vice versa. Thereby, before such a modification, the structures of R 2 and Y 1 may be beyond of what is claimed hereinafter. After such modification steps, the BOC protecting group in compounds of general formula XI can removed again by standard acidic deprotection conditions to yield modified compounds of general formula I.
• the compound may exist as a free base or a salt, depending on the synthesis conditions and the processes of workup and purification applied.
• the compound is not limited to the free base or a certain salt form.
• the stoichiometry of the counterion is usually omitted.
• the compound is not limited to the mono salt and that it may exist as a disalt, trisalt or other compound:counterion stoichiometries.
• such compound may unexpectedly exist as a free base or as a salt with a different counterion, depending on the synthesis conditions and the processes of workup and purification applied.
• 3,5-Diamino-6-bromopyrazine-2-carboxylic acid is prepared from methyl 3,5-diamino-6-bromopyrazine-2-carboxylate (which is prepared from methyl 3,5-diamino-6-chloropyrazine-2-carboxylate as described in J. Med. Chem. 10 (1967) 66-75) analogously to the procedure described for the synthesis of intermediate A.1
• intermediate XIV.1 (1 g; 2.86 mmol) in 20 mL, methanol is added sodium hydroxide solution 2 mol/L (4.3 mL; 8.6 mmol) and the mixture is stirred at r.t. over night. The mixture is concentrated, diluted with water, neutralized with 2N HCl and freeze-dried.
• TMS protected product is further reacted without prior chromatography by stirring in K 2 CO 3 /methanol/water for 2 h to remove the TMS group.
• the precipitate formed upon addition of ice-water is filtered off and purified by silica gel column chromatography (DCM/(methanol:ammonia 9:1) 100:0 ⁇ 90:10).
• the compound is prepared as described for example 1.1 from intermediate C.2 and intermediate I.1.
• the crude product is purified by RP-HPLC (column: Xbridge; water-ACN; modifier NH 3 ).
• Alkyne applied example 1.12; Azide applied: 1-azido-3,6,9-trioxaundecane-11-ol
• HPLC retention times are measured under the following parameters.
• Mouse kidney M-1 cells were cultivated in DMEM containing 5% FCS and 5 ⁇ M dexamethasone for 10 to 12 days on polyester transwell filters. Filters were inserted into a teflon-coated well-plate which fit into the in-house ussing chamber system. Prior to measurement the medium of M-1 cells was replaced with Caco-2 transport buffer (Invitrogen, Germany). During measurements, the Ussing chamber temperature was kept at 37° C. Short circuit currents (I_sc) were measured in the voltage-clamp mode using an in-house built amplifier (Boehringer Ingelheim, Biberach) with the software package Lab View for data acquisition and analysis.
• I_sc Short circuit currents
• the transepithelial electrical resistance (TEER) was determined by the application of voltage steps of ⁇ 5 mV every 5 sec. Compounds were administered at a final concentration of 3 ⁇ M or at increasing concentrations (1-3-10 ⁇ M) to the apical solution. At the end of each experiment the amiloride sensitive I_SC was measured by adding 3 ⁇ M amiloride to the apical compartment. Results are expressed as inhibition in percent of the amiloride effect or as IC 50 . With the example compounds given above, the following IC 50 values were determined in the Ussing Chamber assay:
• the compounds of formula (I) are characterised by their wide range of applications in the therapeutic field. Particular mention should be made of those applications for which the compounds according to the invention of formula (I) are preferably suited on account of their pharmaceutical efficacy as ENaC inhibitors. Examples include respiratory diseases or complaints, or allergic diseases of the airways.
• obstructive diseases of the airways include acute, allergic or chronic bronchitis, chronic obstructive bronchitis (COPD), coughing, pulmonary emphysema, allergic or non-allergic rhinitis or sinusitis, chronic rhinitis or sinusitis, asthma, alveolitis, Farmer's disease, hyperreactive airways, infectious bronchitis or pneumonitis, pediatric asthma, bronchiectases, pulmonary fibrosis, ARDS (acute adult respiratory distress syndrome), bronchial oedema, pulmonary oedema, bronchitis, pneumonia or interstitial pneumonia triggered by various causes, such as aspiration, inhalation of toxic gases, or bronchitis, pneumonia or interstitial pneumonia as a result of heart failure, irradiation, chemotherapy, cyst
• the present invention relates to the use of compounds of formula (I) for preparing a pharmaceutical composition for the treatment of inflammatory or obstructive diseases of the upper and lower respiratory tract including the lungs, such as for example allergic rhinitis, chronic rhinitis, bronchiectasis, cystic fibrosis, COPD, chronic bronchitis, chronic sinusitis and asthma.
• inflammatory or obstructive diseases of the upper and lower respiratory tract including the lungs such as for example allergic rhinitis, chronic rhinitis, bronchiectasis, cystic fibrosis, COPD, chronic bronchitis, chronic sinusitis and asthma.
• the compounds of formula (I) for the treatment of inflammatory and obstructive diseases such as COPD, chronic bronchitis, chronic sinusitis, asthma, cystic fibrosis, particularly COPD, chronic bronchitis, asthma and cystic fibrosis.
• the actual pharmaceutically effective amount or therapeutic dosage will of course depend on factors known by those skilled in the art such as age and weight of the patient, route of administration and severity of disease. In any case the combination will be administered at dosages and in a manner which allows a pharmaceutically effective amount to be delivered based upon patient's unique condition.
• the compounds of formula (I) may be used on their own or in conjunction with other active substances of (I) according to the invention. If desired the compounds of formula (I) may also be used in combination with other pharmaceutically active substances.
• the invention further relates to medicament combinations which preferably contain, besides one or more compounds of formula (I), as further active substances, one or more compounds selected from among the categories of further ENaC inhibitors, betamimetics, anticholinergics, corticosteroids, PDE4-inhibitors, LTD4-antagonists, EGFR-inhibitors, dopamine agonists, H1-antihistamines, PAF-antagonists, MAP-kinase inhibitors, MPR4-Inhibitors, iNOS-Inhibitors, SYK-Inhibitors, corrections of the cystic fibrosis transmembrane regulator (CFTR) and CFTR potentiators, or double or triple combinations thereof.
• CFTR cystic fibrosis transmembrane regulator
• Suitable forms for administration are for example inhalable powders or aerosols.
• the content of the pharmaceutically effective compound(s) in each case should be in the range from 0.2 to 50 wt %, preferably 5 to 25 wt. % of the total composition, i.e. in amounts which are sufficient to achieve the dosage range specified hereinafter.
• the active substance combination may be given as a powder, as an aqueous or aqueous-ethanolic solution or using a propellant gas formulation.
• pharmaceutical formulations are characterised in that they contain one or more compounds of (I) according to the preferred embodiments above.
• the compounds of formula (I) are administered by inhalation, particularly preferably if they are administered once or twice a day.
• the compounds of formula (I) have to be made available in forms suitable for inhalation.
• Inhalable preparations include inhalable powders, propellant-containing metered-dose aerosols or propellant-free inhalable solutions, which are optionally present in admixture with conventional physiologically acceptable excipients.
• propellant-free inhalable solutions also include concentrates or sterile ready-to-use inhalable solutions.
• the preparations which may be used according to the invention are described in more detail in the next part of the specification.
• physiologically acceptable excipients may be used to prepare the inhalable powders according to the invention: monosaccharides (e.g. glucose or arabinose), disaccharides (e.g. lactose, saccharose, maltose), oligo- and polysaccharides (e.g. dextran), polyalcohols (e.g. sorbitol, mannitol, xylitol), salts (e.g. sodium chloride, calcium carbonate) or mixtures of these excipients with one another.
• monosaccharides e.g. glucose or arabinose
• disaccharides e.g. lactose, saccharose, maltose
• oligo- and polysaccharides e.g. dextran
• polyalcohols e.g. sorbitol, mannitol, xylitol
• salts e.g. sodium chloride, calcium carbonate
• lactose is the particularly preferred excipient, while lactose monohydrate is most particularly preferred.
• the propellant-containing inhalable aerosols which may be used according to the invention may contain a compound of formula (I) dissolved in the propellant gas or in dispersed form.
• the propellant gases which may be used to prepare the inhalation aerosols according to the invention are known from the prior art. Suitable propellant gases are selected from among hydrocarbons such as n-propane, n-butane or isobutane and halohydrocarbons such as preferably fluorinated derivatives of methane, ethane, propane, butane, cyclopropane or cyclobutane.
• the propellant gases mentioned above may be used on their own or in mixtures thereof.
• propellant gases are fluorinated alkane derivatives selected from TG134a (1,1,1,2-tetrafluoroethane), TG227 (1,1,1,2,3,3,3-heptafluoropropane) and mixtures thereof.
• the propellant-driven inhalation aerosols used within the scope of the use according to the invention may also contain other ingredients such as co-solvents, stabilizers, surfactants, antioxidants, lubricants and pH adjusters. All these ingredients are known in the art.
• the compounds of formula (I) according to the invention are preferably used to prepare propellant-free inhalable solutions and inhalable suspensions.
• Solvents used for this purpose include aqueous or alcoholic, preferably ethanolic solutions.
• the solvent may be water on its own or a mixture of water and ethanol.
• the solutions or suspensions are adjusted to a pH of 2 to 7, preferably 2 to 5, using suitable acids.
• the pH may be adjusted using acids selected from inorganic or organic acids. Examples of particularly suitable inorganic acids include hydrochloric acid, hydrobromic acid, nitric acid, sulphuric acid and/or phosphoric acid.
• organic acids examples include ascorbic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, fumaric acid, acetic acid, formic acid and/or propionic acid etc.
• Preferred inorganic acids are hydrochloric and sulphuric acids. It is also possible to use the acids which have already formed an acid addition salt with one of the active substances.
• ascorbic acid, fumaric acid and citric acid are preferred.
• mixtures of the above acids may also be used, particularly in the case of acids which have other properties in addition to their acidifying qualities, e.g. as flavorings, antioxidants or complexing agents, such as citric acid or ascorbic acid, for example.
• hydrochloric acid it is particularly preferred to use hydrochloric acid to adjust the pH.
• Co-solvents and/or other excipients may be added to the propellant-free inhalable solutions used for the purpose according to the invention.
• Preferred co-solvents are those which contain hydroxyl groups or other polar groups, e.g. alcohols—particularly isopropyl alcohol, glycols—particularly propyleneglycol, polyethyleneglycol, polypropyleneglycol, glycolether, glycerol, polyoxyethylene alcohols and polyoxyethylene fatty acid esters.
• excipients and additives in this context denote any pharmaceutically acceptable substance which is not an active substance but which can be formulated with the active substance or substances in the pharmaceutically suitable solvent in order to improve the qualitative properties of the active substance formulation.
• these substances have no pharmacological effect or, in connection with the desired therapy, no appreciable or at least no undesirable pharmacological effect.
• the excipients and additives include, for example, surfactants such as soya lecithin, oleic acid, sorbitan esters, such as polysorbates, polyvinylpyrrolidone, other stabilizers, complexing agents, antioxidants and/or preservatives which guarantee or prolong the shelf life of the finished pharmaceutical formulation, flavourings, vitamins and/or other additives known in the art.
• the additives also include pharmaceutically acceptable salts such as sodium chloride as isotonic agents.
• the preferred excipients include antioxidants such as ascorbic acid, for example, provided that it has not already been used to adjust the pH, vitamin A, vitamin E, tocopherols and similar vitamins or provitamins occurring in the human body.
• Preservatives may be used to protect the formulation from contamination with pathogens. Suitable preservatives are those which are known in the art, particularly cetyl pyridinium chloride, benzalkonium chloride or benzoic acid or benzoates such as sodium benzoate in the concentration known from the prior art.
• ready-to-use packs of a medicament for the treatment of respiratory complaints are provided, containing an enclosed description including for example the words respiratory disease, COPD or asthma, a compound according to the invention and one or more combination partners selected from those described above.
• 1 capsule contains:
• the active substance is mixed with lactose for inhalation.
• the mixture is packed into capsules in a capsule-making machine (weight of the empty capsule approx. 50 mg).

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